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https://issues.apache.org/jira/browse/HIVE-4642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13674690#comment-13674690
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Eric Hanson commented on HIVE-4642:
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I think this sounds good except that using multi-threaded parallelism is not a
good idea here. We should rely on getting parallelism for large data sets by
having multiple splits processed in parallel in different processes. Using
file-grain multi-threaded parallelism within a process only for purposes of
speeding up RLIKE/REGEXP does not see appropriate. I'd recommend focusing on
the fastest operation you can get within a single thread, at least for common
patterns, or maybe even all possible patterns.
> Implement vectorized RLIKE and REGEXP filter expressions
> --------------------------------------------------------
>
> Key: HIVE-4642
> URL: https://issues.apache.org/jira/browse/HIVE-4642
> Project: Hive
> Issue Type: Sub-task
> Reporter: Eric Hanson
> Assignee: Teddy Choi
>
> See title. I will add more details next week. The goal is (a) make this work
> correctly and (b) optimize it as well as possible, at least for the common
> cases.
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